| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [prep] [noun] | 14 |
|
| 2 | it must [prep] [noun] | 14 |
|
| 3 | it must [prep] [noun sg] | 13 |
|
| 4 | it must of [noun] | 6 |
|
| 5 | it must in [noun] | 5 |
|
